Ventilating unit



Nov. 11, 1952 0, A SUTTON 2,617,348

VENTILATING UNIT Filed Dec. 2, 1949 3 Sheets-Sheet 1 5MM/wam ffm/AME .5'/4 2/ Nov. 11, 1952 o. A. SUTTON VENTILATING UNIT 3 Sheets-Sheet 2 FiledDec. 2,v 1949 Nov. 1l, 1952 o, A, SUTTON 2,617,348

VENTILATING UNIT Filed D60. 2, 1949 3 Sheets-Sheet 3 INVENTOR. l y l.-/l BYOULS'A. uton wwuvv Patented Nov. 11, 1952 VENTILATING UNIT oms A.Sutton, Wichita, Kans., assigner mijne 0. A. Sutton Corporation, Inc.,Wichita, Kans.,y

a corporati'onofKansas ApplicationD'ecember 2, 1949',- Serial No.l130,621-

(c1.V sis-921).

Claims;

My present inventionrelates to window venti-Y lating units which areparticularlyadapted to be associated with windows of the verticallymoving type but which may be readily` associated'with other types ofwindows' or placedin openings in walls especially preparedfor'thepurpose.

A principalobject of the'in'vention is to. provide a window Ventilatingunit including av movable fan unitin which anairpropeller. and adirectly connected motorv are so .arranged within a cowl surrounding thepropeller4 as'.to create aV stream of moving ai): which maybe directedacross a room in any desired .mannerthereby materially increasing thecomfort'of occupants of the room by placingit within4 their power todirect the most rapidlymoving air horizontally in their direction orotherwise as desired, either downwardly across theoor or upwardlyagainst the ceiling of the room.`

Another object of thev present invention is vto provide a constructionof the foregoing type in which the position ofthefan'unit'includingv thesurrounding cowlmay be rapidly reversed even while the propeller is inOperation' sothat air may be exhaustedfromthe.` room with a minimum ofeffort on the part of the occupant, thereby making it p ossible'toclearstale air orV odors from the room at any time without'requiring theuse of tools or specialknowledgeof `mechanical operations. v

A further object of the present inventionis to provide a windowVentilating unitV in'which'the direction of the airstreamv acrossa'roonr may be changed from the horizontaltozany upwardinclination up tosubstantially 60Y degrees while the window is rpartially closedbehindthe vvVentilating unit, thereby making itv possibleforthe windowA to beopened slightly duringver-y cold weather and the cold stream of air-*tobe directedupwardly into thewarmer'l stratasA of 'air iny the ceilingarea of a room beforegently circulating downwardly through thevzone.ofoccupancy vof the room, thereby avoiding.thercreation of kcold draftswhile permitting-,constant fresheningY of the air in a substantiallyclosed froom;

A further object of the present invention isgto provide al windowAventilatingunit ofvthe char-- acter described inv which at all timesair from the interior of the room is .caused torecirculate andbecomeadmixed withthe streamV of fresh air being drawn into the roomthroughan open-window, thereby maintaining moreeven tempering of the airwithin a. room.A I

A further object of the present invention is to provide a windowVentilating unit which is easy to installV andN which may be'readil'yadjusted to;

nt windows and the like ofvarying'widthsf A further z object ofy thepresent invention i s to provide aiwindow'VentilatingV unit in whichmeansr are providedto limit' the extent of' downward inclination ofthefstream of air produced thereby sok asA to aidl the creationfof;comfortable conditions within the room5in=spiteof the lacl;` oftechnical knowledge-off proper airconditioning procedure-by the averageovccupantfoftheroom.

A further objectof the present inventionfis` to provide-a sturdyconstruction vof` theforegoing character *withfa minmumfamount '-oflfabricated partsg-jinwhichj thepositiony the fanlmay be instantaneouslyadjusted and `by. means-of which the fan may be retained in any-adjustedposition without being` dislodged therefrom due to vibration.

The foregoingandother objects and advantages of the` presentV inventionymay. bei more readily ascertainedfroniinspection of the followingspecication takenlin'connectionwith the accompanying, drawing whereinlike numerals refer to like .partsthroughout,v while the featuresofn'ovelty willbe more distinctly pointed out in the appen'c'led claims.l y

In the drawing, Fig; 1 isa front view, in elevation, ofawndw-ventilating'unit conforming to the present invention; Y y

Fig. 2 is arear View, ir"1`1elevation,A .with parts broken away to showinterio'rdetails;v

Fig.. 3 is a horizontal section, ,on an enlargedl scale, takensubstantiallyy along line 3--3 of Fig'..2; y

Fig. Llis a horizontal section, on an enlarged scale, takensubstantially along line' IIL-fl` of Fig. 1;

Fig. 5 is a sideview, in'elevation, with'aV corner broken away toshowinterior details; ,K

Fig. 6" is a Vertical section, on'an enlarged scale, takensubstantially' along line 6-6 of Fie. 2;

Fig. '7" is a sideview; in elevation; similar "to Fig. 5 but showing thefan unit in' reversed position in order that the Ventilating unit' maybe used 'as anexh'aust'unit;v p n Fig.V 8 is ajschematic viewjshowingthe normal operation ofthe unit as a Ventilating unit directing airhorizontally across a roomjA y Fig. 9'isajviewv similar toFig;`lSjshowing the unit in operation asan exhaust unit; p

Fig. IO-is ja' View similar vto Y'Figr vshowing the unit in action aslan aircirculatingandwfresh vair admittingunit 'during'jcold` Weather;and"v Fig. 11 is a viewv similar to Fig. 8 showing the unit in'-operation duringhot weather.`

The 'window Ventilating Vunit comprises a housingv generally "indicatedbythe numeral I 0 and inpreferably formed by bending the front wallrearwardly, a bottom wall I5 provided by a flanged plate having itsflanges embracing the front and side wall lower edges, and a top wall I6provided by a similar flanged plate. The upright rear edge of the sidewall I3 is flanged inwardly to provide a vertical stiffener ange I1 anda, similar vertical stiffener flange I8 is provided at the rear edge ofthe side wall I4. Longitudinally extending top and bottom braces I9 and20 are welded or otherwise affixed at their ends to the flanges I1 andI3 to provide a rigid housing structure in which the fan unit ismounted.

The fan unit comprises a cowl formed of an outer, annular shell 2|having its end edges bent inwardly to embrace the end edges of an inner,annular shell 22, the outer shell being outwardly convex and the innershell being outwardly concave in order to provide an aerofoilconstruction of ring shape, as disclosed and claimed in my copendingapplication, Serial No. 120,504, led October 10, 1949. A'plurality ofradially extend- Ving arms 25 are attached to the inner surface of shell22 as by means of screws 25, the arms being attached at their inner endsto a motor mounting ring 21 through resilient connections includingrubber grommets 28 and screws 29. The ring 21 embraces the outer surfaceof a blower motor 30 and the grommets 28 tend to prevent thetransmission of noise and vibrations through the arms 25. The arms 25are offset slightly at intermediate points to provide means forconcentrically locating an air directing funnel 3| through which thearms 25 pass and which are isolated therefrom by means of rubbergrommets 32. The inner shell 22 and the funnel 3| provide highly eicientair directing means embodying the principles of the patent to Odor etal., No. 2,330,907, issued October 5, 1943, whereby air is mostefficiently introduced to an air impeller comprising a hub 35 mountedupon the shaft 36 of the motor and having a plurality of radiallyextending blades 31 located within the constricted portion of the cowland arranged to direct air forwardly through the constricted end of thecowl. A grille 38 is preferably mounted across the constricted end ofthe cowl as by means of spring -clips 39 and radial grille members 40,as set forth and claimed in my copending application, Serial No.120,503, led October 10, 1949. A plurality of radially extending,substantially W-shaped rods 4| are mounted upon the inner end of thefunnel 3| so as to prevent the entry of curtains or the like intoengagement with the fan blades from the rear end of the fan unit.

The fan unit including the cowl, funnel, motor, propeller and associatedparts, is pivotally mounted for rotation about a transverse axis normalto the longitudinal axis of the cowl. The pivotal axis of the fan unitis preferably horizontal for reasons to be described and is arrangedclose to the inner surface ofthe front wall I2 of the housing andsubstantially in alignment with the center of gravity of the fan unit.In order that the cowl may project through the front wall, the wall isprovided with a circular opening 45 of slightly greater diameter thanthe largest diameter of the cowl, the edge thereof being preferablyflanged rearwardly so as to prevent abrasion or cutting of fingers whichmight come in contact therewith. The means for providing the pivotalaxis include a pair of horizontally extending trunnions 50 and 5I, whichtrunnions are preferably short sections of tubes having their inner endsreduced to provide shoulders against which the surface of the shell 2|may be seated when the reduced ends are passed through closely fittingopenings in the shell. The reduced ends which protrude into the shellare peened over or welded or soldered to the inner surface of the shellso as to provide outwardly extending, tubular trunnion members lyingalong the horizontal diameter of the fan unit.

Each of the trunnions is rotatably mounted in pivot means including anarcuate bearing 52 formed in the upper end of a fixed bracket 53 havingits lower end connected to an inwardly offset portion of the lowerportion 54 of the lower horizontal member 20 by means of a screw 55 andhaving its upper end attached to the front wall I2 by means including apair of long studs 56 passing through the wall I2 and having nuts 51thereon for engaging the bracket 53. The trunnion is retained in thearcuate bearing 52 by a strap including an arcuate intermediate portionand having a pair of holes at its ends through which the studs 56 pass.The ends of the strap 60 are resiliently urged toward the front wall I2by strong springs 6I compressed between the ends of the strap andwashers 62 retained on the ends of studs 56 by outer nuts 63, the nutsproviding means whereby the compression of f springs 6I may be adjustedto the extent required to prevent accidental rotation of the fan unitbut to permit rotation thereof upon the application 0f manual pressureto any protruding portion of the fan unit.

The bearing portion 52 of the bracket 53 is defined by axially extendingedge portions 65 adjacent the upper edge of the trunnion and 66 adjacentthe lower edge thereof, said axially extending portions being engageableby the protruding end of a limiting pin 61 which is shown in full line(Fig. 6) as limiting the position of the fan unit by engagement with theaxial edge 65, and in dash line as limiting the movement of the unit atthe opposite extreme. The arcuate bearing 52 or the angular distancebetween the axial portions 65 and 66 is less than 180 degrees and thearrangement of the pin 61 to the fan unit is such that the fan unit maybe rotated to face outwardly at one extreme, and may be inclineddownwardly at about 30 degrees at the other.

The pin 61 during rotative movement travels through a longitudinallyextending slot 68 in the strap 60, thereby providing means forpreventing lateral displacement of the fan unit ,with respect to thehousing.

- mounted in the inner shell 22 and a rubber grommet 12 mounted in thefunnel 3| to reach the motor. The cable is conveniently held against theflange I8 by a tongue clip 13 fastened thereto, and from there extendsto a control box 14 retained againstthe inner surface of the front wallI2 by a bracket 15. A switch knob 16 is connected to the operating shaft(not shown) of the control box which extends forwardly through anopening in the front wall and is preferably of the type which may bemoved t0 a plurality of different positions in order to control thespeed of the motor, the motor preferably being of a type which may beoperated at different speeds. Power is led to the control box through asupply cable 11, also retained by the tongue 13, which passes through arubber grommet 18 in theside wallV I4 to a source of-power such`r as aplug-in connector (not shown) so that the unit may be moved from windowto window. The opposite flange vIl is preferably providedwwith ya cliptongue i9 so that units may be fabricated with right or left-handconnector, cables asdesired. The construction isA such that rotation ofthevfan unit about itshorizontalaxisvmay be accomplished withoutinterference and without requiring stoppage of the motor, the cable 'IIJmerely slipping Withinthe trunnion 5B as the fan unit is rotated.

In order that the unit may be mountedv inv a window opening as quicklyand conveniently as possible, the rear edges of. the upperv and lowerflanged plates land I6 areattached to longitudinally extending,horizontal channels 8l and 8'2 respectively,l with the channels facingeach other across the outer surface of the housing.A A pair of side wingpanels 83 and84 are mounted on the unit by having upper andllowerchanneled edges thereof, 85 and 86jrespectivelyslidably engaged withinthe upper and lowerl channels 8| and 82 vfixed to the housing.A Theinner edge of each panel has a pair of horizontally extending bars 8lwelded thereto and projectingtinwardly therefrom. The inner end ofY eachbar 81 is notched at 88 to provide means for attachingone end of a longtension spring 89,'the oppositev end of which is attached to a hooktongue SUstruck inwardly from the inner stiiener flangevat the verticaledge of the adjacent side wall. A pair of studs 9| projecting inwardlyfrom the side wing panel engage the inner edge of the side wall flangeto limit outward movement of the side wings. Inward movement of thepanels islimited by a pair of handles 95 which'project forwardly fromthe outer edges of the side wing panels. The outer edge of each panel isflanged rearwardly at 95, the upper end of the flange projectingupwardly and being provided with ar keyhole slot 9i. which may beengaged with a lscrew or the like mounted in the window casing or thelike so as to prevent the unit from falling forwardly from an opening inwhich itis mounted. Of course, with some windows the flanges 96 -of theside wing panels may extend into sash grooves or the like in the windowopening, thus eliminating the necessity for engagement of screws withthekeyhole slots 91. The inner edge of eachvof the side wing panels isprovided with an arcuate` recess 98 of substantially the same diameteras the opening 45 and aligned therewith so that the side wing panels maybe moved inwardly toward the center of the unit to a substantialextentwithout interfering with air movement through the housing.

In order to mount the unit within a window opening or the like, thehandles 95 may be employed to lift the unit, in so doing the hands beingforced toward each other to slide the side wing panels toward eachother. When the unit is resting upon a window sill or the lower edge ofan opening, the springs 89 will force the side'wing panels away fromeach other until the anges 99 engage the sides of theopeningfthusproviding means for blocking the opening eXceptAfor-thepassage provided through the fan unit. andthe opening d.

The shape of the outer shell 21 is substantially that of a sphericalZone, the greatest chord of the zone being of lesser length .thanthediameter of the openingll. The .pivot meansliealong a chord of the cowlclosely adjacent the larger. end ofthe cowl and the. pin6`lfiassociatedwithi the 6. slot r68Y holds the surface Yof the cowlViti-spaced` relationl to" the edge of the opening 4iso that -allportions, of the fan-unit may pass i through the opening A57-to variousangular positions as illustrated in Figs. 8-to 1 1, inclusive. Inthese-figures the housing IUis shown inits-position-of use upon a4window sill 99 with the-keyhole slotsV 91v inthe side wing flangesengaging screws |90 -irrtheinner surface of the window frame.

OperationV In Fig. 8 theunitis shown. in. operation as La Ventilatingyunit bringing fresh air fromftheex-l terior and projecting it.horizontally across. the room, in thiscase the lower window beingrraised to the upper edge of the housing Ill so as .to obtain thegreatest possible amount of fresh air.

In Fig. 9 the fan unit has been reversed within the housing by swingingit about the pivot means so that the unit is operating as an exhaustunit to discharge the greatest amountV of air possible from the interiorof the room through the openl window. It willbe appreciated that theunit may be so located with respect to the house that cool air may bedrawn from the basement up to the top bedroom floors so as to cool theinterior of the whole house, or that a single room may be ventilated bythe exhaust of stale air through the open window.

In Fig. 10 the unit is illustrated in the position in which it would beplaced in order to recirculate a large proportion of the air intheroomiwhile adding thereto a smaller percentage of fresh air drawninwardly through the crack between the partially lowered inner windowand the bottom of the window sill, this being a preferred position ofusage when the room is occupied by sleeping persons in thewinter. Whenso positioned a stream of mixed recirculated and fresh air is directedtoward the ceiling to become tempered byadmixture with the Warmer airnear the ceiling before circulating down through the Zone of occupancy.Thus strong drafts are avoided and the sleepers are contacted only bygently moving currents of warmed air to which is constantly being addeda percentage of fresh air. Itv will be noted in this diagram that theaxis of the fan unit has been tilted substantially 60 degreesy from thehorizontal, which is aboutthe limit to which theA fan could be tiltedwithout interferingwith the panes of the lower window unless the depthof housing I0 were increased beyond reason. If tilted upwardly to aslightly lesser extent, the window could be raised and loweredcompletely Without interference from the cowl or the funnel. In thisposition recirculated air is drawn upwardly into the outerportions ofthe cowl and funnel and fresh air is drawn into the intermediate andinner portions thereof, the two streams of air being mixed by thebeating action of the fan blades before being projected into the room.

In Fig. 11 the fanunit is illustrated when arranged for the introductionof some fresh air to be mixed with recirculated room air as, for eXample, during the summer when it is desirableto introduce fresh air. toreplace the air which has been devitalized by human use, but it is notdesirable to introduce the full volume of air possible. The inner windowis illustrated as `being fully lraised but, of course, it may be moveddownward to any positionsuch as that illustratedy in Fig. 10 in order tolimit the volume of rvfresh air admitted. This, arrangement might bepreferred during the 4summer;` particularlyin fair" condi;

tioned enclosures, since the fresh air is directed into the cooler airnear the oor.

Regardless of the position to which the fan unit is adjusted, thetension of springs 6l holds the unit in the desired position. The pin61, while permitting angular displacement from a limit such asillustrated in Fig. 8 through more than 180 degrees to a limit such asillustrated in Fig. 10, prevents complete rotation of the unit andtwisting of the cable 'l0 beyond the breaking point.

Having illustrated and described preferred embodiments of the invention,it should be apparent to those skilled in the art that the inventionpermits of modication in arrangement and detail. I claim as my inventionall such modifications as come within the true spirit and scope of theappended claims.

I claim:

1. A window Ventilating unit comprising a casing adapted to be mountedin a window frame and including a front wall having a circular openingtherethrough, a fan assembly mounted in said casing, said fan assemblyincluding an annular cowl including an outwardly convex outer shell andan outwardly concave inner shell, each of large diameter at the inletend of the cowl and smaller diameter at the outlet end of the cowl, saidshells being connected together at their large and small endsrespectively, said cowl having a maximum external diameter slightly lessthan the diameter of said opening, and pivot means mounted on said frontwall closely adjacent the inner surface of said front wall andsupporting said cowl in said casing, the axes of said pivot means lyingalong a maximum diameter of said cowl and in a horizontal plane throughthe diameter of said opening whereby said fan assembly projects throughsaid opening, all portions of said fan assembly lying within a distancefrom the center of said opening equal to the maximum radius of the cowlwhereby said fan assembly may be pivoted about to propel air in oppositedirections through said opening.

2. A window Ventilating unit comprising a casing adapted to be mountedin a window frame and including a front wall having a circular openingtherethrough, a fan assembly mounted in said casing, said fan assemblyincluding an annular cowl including an outwardly convex outer shell andan outwardly concave inner shell, each of large diameter at the inletend of the cowl and smaller diameter at the outlet end of the cowl, saidshells being connected together at their large and small endsrespectively, said cowl having a maximum external diameter slightly lessthan that of said opening, pivot means mounted on said front wallclosely adjacent the inner surface of said front wall and supportingsaid cowl in said casing, the axes of said pivot means lying along amaximum diameter of said cowl and in a horizontal plane through thediameter of said opening whereby said fan assembly projects through saidopening, all portions of said fan assembly lying within a distance fromthe center of said opening equal to the maximum radius of the cowlwhereby said fan assembly may be pivoted about to propel air in oppositedirections through said opening, said pivot means including a pair oftrunnions and a pair of bearing assemblies pivotally supporting saidtrunnions, and friction means resisting relative rotation of saidtrunnions and bearing assemblies whereby said fan assembly may beretained in various positions.

3. A window Ventilating unit comprising a casing adapted to be mountedin a window frame and including a front wall having a circular openingtherethrough, a fan assembly mounted in said casing, said fan assemblyincluding an annular cowl including an outwardly convex outer shell andan outwardly concave inner shell, each of large diameter at the inletend of the cowl and smaller diameter at the outlet end of the cowl, saidshells being connected together at their large and small endsrespectively, said cowl having a maximum external diameter slightly lessthan the diameter of said opening, pivot means mounted on said frontwall closely adjacent the inner surface of said front wall andsupporting said cowl in said casing, the axes of said pivot means lyingalong a maximum diameter of said cowl and in a horizontal plane throughthe diameter of said opening whereby said cowl projects through saidopening, all portions of said fan assembly lying within a distance fromthe center of said opening equal to the maximum radius of the cowlwhereby said fan assembly may be pivoted about to propel air in oppositedirections through said opening, said casing including means dening anenclosure of considerable depth behind said front wall and means deningan air inlet at the rear thereof, and mounting means at the rear of saidenclosure adapted to engage opposed, vertical portions of a window framewhereby said casing may be mounted closely adjacent a window, said fanassembly being of such dimensions with respect to said casing that itmay be swung through a substantial arc without projecting into the planeof the window.

4. A window Ventilating unit comprising a casing adapted to be mountedin a window frame and including a front wall having a circular openingtherethrough, a fan assembly mounted in said casing, said fan assemblyincluding an annular cowl including an outwardly convex outer shell andan outwardly concave inner shell, each of large diameter at the inletend of the cowl and smaller diameter at the outlet end of the cowl, saidshells being connected together at their large and small endsrespectively, said cowl having a maximum external diameter slightly lessthan that of said opening, pivot means mounted on said front wallclosely adjacent the inner surface of said front wall and supportingsaid cowl in said casing, the axes of said pivot means lying along amaximum diameter of said cowl and all portions of said fan assemblylying within a distance from the center of said opening equal to themaximum radius of the cowl whereby said fan assembly may be pivotedabout said axis to propel air in opposite directions through saidopening, said fan assembly including a funnel located coaxially withrespect to said cowl and having its smaller end extending partially intosaid cowl, a motor located coaxially within said funnel and including ashaft extending coaxially forward into said cowl, an impeller mounted onsaid shaft and including a plurality of blades extending radially infront of the smaller end of said funnel to within a short distance ofsaid cowl, and a plurality of radially extending, elongated members ofrelatively small width spanning the spaces between said motor and funneland between said funnel and cowl to provide a rear guard for saidblades, said elongated members including a plurality of radiallyextending arms connected at their ends to said motor and to said cowlwith intermediate portions thereof supporting said funnel, and aplurality of radially extending rods mounted at intermediate pointsthereof on the forward edge of said funnel and having their end portionsextending freely across the spaces between 4said cowl and funnel andbetween said funnel' and motor.

5. Awindow 'Ventilating fan comprising a casopposite sides of saidcircular opening, each of saidbraces extending 'from the'lower rearportion of said casing to said front wall 'of isaid casing above thehorizontal center line of said circular opening, that portion of each ofsaid braces' ad- 'jacent to said front wall including an arcuate bearingportion facing away from said front wall, a fan assembly including apair of trunnions extending horizontallyA on opposite sides thereof,said trunnions pairing with said arcuate bearings of said braces,respectively, a limit member on at least one of said ktrunnionsextending radially thereof, a pair of straps, each of said strapsincluding Van arcuate bearing portion adapted to bear against adifferent one of said trunnions, means positioning said strapssubstantially opposite said rst mentioned Abearing portions,respectively, the one of said straps engaging the trunnion having alimit 'member thereon having a slot therein through which said limitmember displaces yupon turning said fan assembly, and means for springtensioning said straps against said trunnions, respectively.

6. vIn a window Ventilating fan includinga motor and an air impellerdriven by said motor, means for rotatably mounting said motor forselectively reversing the direction in which air is displaced, saidmeans comprising: a pair of trunnions extending substantiallyhorizontally from opposite sides of said motor, pivot means for one ofsaid trunnions, a fixed bracket plate including an arcuate bearinghaving two axial edges and a bearing portion therebetween adapted tobear against less than 180 degrees of the other of said trunnions, astop pin projecting substantially radially from said other trunnion andpositioned for engagement with the two axial edges of said bearing, saidother trunnion being turnable between the two positions determined byalternative contact of said stop pin with said two axial edges, twothreaded studs extending from said bracket plate on opposite sides ofsaid arcuate bearing surface, a strap having a pair of holestherethrough spaced for engagement with said threaded studs, said strapalso including an arcuate bearing adapted to bear against said othertrunnion opposite said first-mentioned bearing, said last-mentionedbearing having a slot therein through which said stop pin moves uponrotation of said other trunnion, two nuts, each of said nuts on adifferent one of said studs, two helical springs, each of said springsmounted on and concentric with a different one of said studs, and twowashers, each of said washers on a different one of said studsinterposed between said nut and said spring on said one stud, saidsprings being constrained between said strap and said washers,respectively.

7. In a window Ventilating fan including a motor and an air impellerdriven by said motor, means for reversing the direction in which air isdisplaced, said means comprising: a pair of trunnions extending fromopposite sides of said motor, pivot means for one of said trunnions, yafixed bracket plate including a bearing having two axial edges and abearing portion therebetween adapted to support the other of saidtrunnion-s through less than 180 degrees, a stop member projectingsubstantially radially from said other trunnion and positioned forengagement with the twoV axial edges of said bearing, said motorv beingfturnablebetween the two positions determined by alternative contact ofsaid stop member with'said two axial edges, a strap including a'bearingadapted to contact said other trunnion opposite Ysaid first-mentionedbearing, .said last-mentionedbearing having a slot therein positioned toprovide clearance for said stop member as said Aother trunnion turns`between said two positions, means supporting said strap for movementtoward and away from said other trunnion, and spring means operativelyconnected to said strap and urging said strap 'toward said othertrunnion, whereby'said other trunnion is frictionally `clamped betweensaid bearings.

8. A window Ventilating unit comprising a supporting structure adaptedto be placed in and substantially close 'a'window or other suitableopening inawall of a room, said structure 'having a vertical wall, saidwall having a relatively large, circular opening therethrough, a pair ofpivot means mounted onsaid wall at opposite sides of said opening, saidpivot means defining a pivotal axis lying ina horizontal plane'includingthe horizontal diameter of' said opening and beingclosely adjacent toand parallel to the horizontal diameter of said opening, a cowlpivotally supported by said pivot means, said cowl comprising an annularouter member having a large open end and a small open end, said annularouter member being inwardly concave, the large end of said annular outermember being slightly smaller than the opening through said wall andsaid pivot means being attached to said cowl at opposite ends of adiameter thereof closely adjacent the large end whereby said cowl ispivotally supported for rotation about said pivotal axis, a motorconcentrically mounted within said cowl adjacent the large end thereof,said motor including a shaft projecting toward the small end of saidcowl, and a propeller xed to said shaft, said propeller being adjacentthe small end of said cowl and being adapted to draw air into the largeend of said cowl and discharge the air through the small end thereof.

9. A window Ventilating unit comprising a supporting structure adaptedto be placed in and substantially close a window or other suitableopening in a wall of a room, said structure having a vertical wall, saidwall having a relatively large, circular opening therethrough, a pair ofpivot means mounted on said wall at opposite sides of said opening, saidpivot means defining a pivotal axis lying in a horizontal planeincluding the horizontal diameter of said opening and being closelyadjacent to and parallel to the horizontal diameter of said opening, acowl pivotally supported by said pivot means, said cowl comprising anannular outer member having a large open end and a small open end, saidannular outer member being inwardly concave, the large end of saidannular outer member being slightly smaller than the opening throughsaid wall and said pivot means being attached to said cowl at oppositeends of a diameter thereof closely adjacent the large end whereby saidcowl is pivotally supported for rotation about said pivotal axis, amotor concentrically mounted within said cowl adjacent the large endthereof, said motor including a shaft projecting toward the small end ofsaid cowl, a propeller fixed to said shaft, said propeller beingadjacent the small end of said cowl and being adapted to draw air intothe large end of said cowl and discharge the air through the small endthereof, said cowl being rotatable about said pivotal axis through anarc of at least 180 degrees from one position at which its axis issubstantially horizontal and the small end thereof projects into theroom from said wall to an opposite position at which its axis issubstantially horizontal and the small end thereof projects outwardlyfrom said wall, and friction means associated with said pivot means andresisting rotation of said cowl about said pivotal axis whereby saidcowl will remain at either of the above-defined positions or in anyselected intermediate position.

10. A Ventilating unit comprising a substantially rectangular supportingstructure including adjustable means whereby the supporting structuremay be slipped into a window opening or the like and adjusted to t saidopening, said structure including a vertical wall having a circularopening therethrough, and a fan unit pivotally mounted on said wall forpivotal movement about a horizontal axis closely adjacent the horizontaldiameter of said opening, said fan unit including a hollow, streamlinedcowl having an inwardly concave outer surface and an inwardly convexinner surface, said cowl being in the shape of a ring having a uniformaerofoil cross-section and having one end larger than the other, thelarger end of said ring being relatively sharp and the smaller end ofsaid ring being relatively blunt, said larger end being slightly smallerthan said opening and said fan unit being pivotally sup- 12 ported alonga diameter of said cowl near the larger end thereof whereby said fanunit may swing about through said opening, a motor concentricallymounted within said cowl, a propeller xed to said motor and rotatingabout the axis of said cowl, said propeller lying adjacent the smallerend of said cowl and being rotatable in a direction to draw air throughsaid cowl from the larger end and project the same through the smallerend, and said cowl being movable about its pivotal axis through at leastdegrees whereby the propeller may exhaust air from the room or supplyair to the room.

OTTIS A. SUTTON.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,011,799 Inglis Dec. 12, 19111,769,922 Harris July 8, 1930 2,123,448 Weber July 12, 1938 2,153,576Kurth et al Apr. 11, 1939 2,203,491 Euwer June 4, 1940 2,285,161 JennJune 2, 1942 2,330,907 Odor et al Oct. 5, 1943 2,378,012 Herbster June12, 1945 2,418,760 Cucci Apr. 8, 1947

